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        <a href="../.." >web worker</a>
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                                <section class="normal markdown-section">
                                
                                <h1 id="web-worker">Web Worker</h1>
<h2 id="&#x6982;&#x8FF0;">&#x6982;&#x8FF0;</h2>
<p>JavaScript &#x8BED;&#x8A00;&#x91C7;&#x7528;&#x7684;&#x662F;&#x5355;&#x7EBF;&#x7A0B;&#x6A21;&#x578B;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x8BF4;&#xFF0C;&#x6240;&#x6709;&#x4EFB;&#x52A1;&#x53EA;&#x80FD;&#x5728;&#x4E00;&#x4E2A;&#x7EBF;&#x7A0B;&#x4E0A;&#x5B8C;&#x6210;&#xFF0C;&#x4E00;&#x6B21;&#x53EA;&#x80FD;&#x505A;&#x4E00;&#x4EF6;&#x4E8B;&#x3002;&#x524D;&#x9762;&#x7684;&#x4EFB;&#x52A1;&#x6CA1;&#x505A;&#x5B8C;&#xFF0C;&#x540E;&#x9762;&#x7684;&#x4EFB;&#x52A1;&#x53EA;&#x80FD;&#x7B49;&#x7740;&#x3002;&#x968F;&#x7740;&#x7535;&#x8111;&#x8BA1;&#x7B97;&#x80FD;&#x529B;&#x7684;&#x589E;&#x5F3A;&#xFF0C;&#x5C24;&#x5176;&#x662F;&#x591A;&#x6838; CPU &#x7684;&#x51FA;&#x73B0;&#xFF0C;&#x5355;&#x7EBF;&#x7A0B;&#x5E26;&#x6765;&#x5F88;&#x5927;&#x7684;&#x4E0D;&#x4FBF;&#xFF0C;&#x65E0;&#x6CD5;&#x5145;&#x5206;&#x53D1;&#x6325;&#x8BA1;&#x7B97;&#x673A;&#x7684;&#x8BA1;&#x7B97;&#x80FD;&#x529B;&#x3002;</p>
<p>Web Worker &#x7684;&#x4F5C;&#x7528;&#xFF0C;&#x5C31;&#x662F;&#x4E3A; JavaScript &#x521B;&#x9020;&#x591A;&#x7EBF;&#x7A0B;&#x73AF;&#x5883;&#xFF0C;&#x5141;&#x8BB8;&#x4E3B;&#x7EBF;&#x7A0B;&#x521B;&#x5EFA; Worker &#x7EBF;&#x7A0B;&#xFF0C;&#x5C06;&#x4E00;&#x4E9B;&#x4EFB;&#x52A1;&#x5206;&#x914D;&#x7ED9;&#x540E;&#x8005;&#x8FD0;&#x884C;&#x3002;&#x5728;&#x4E3B;&#x7EBF;&#x7A0B;&#x8FD0;&#x884C;&#x7684;&#x540C;&#x65F6;&#xFF0C;Worker &#x7EBF;&#x7A0B;&#x5728;&#x540E;&#x53F0;&#x8FD0;&#x884C;&#xFF0C;&#x4E24;&#x8005;&#x4E92;&#x4E0D;&#x5E72;&#x6270;&#x3002;&#x7B49;&#x5230; Worker &#x7EBF;&#x7A0B;&#x5B8C;&#x6210;&#x8BA1;&#x7B97;&#x4EFB;&#x52A1;&#xFF0C;&#x518D;&#x628A;&#x7ED3;&#x679C;&#x8FD4;&#x56DE;&#x7ED9;&#x4E3B;&#x7EBF;&#x7A0B;&#x3002;&#x8FD9;&#x6837;&#x7684;&#x597D;&#x5904;&#x662F;&#xFF0C;&#x4E00;&#x4E9B;&#x8BA1;&#x7B97;&#x5BC6;&#x96C6;&#x578B;&#x6216;&#x9AD8;&#x5EF6;&#x8FDF;&#x7684;&#x4EFB;&#x52A1;&#x53EF;&#x4EE5;&#x4EA4;&#x7531; Worker &#x7EBF;&#x7A0B;&#x6267;&#x884C;&#xFF0C;&#x4E3B;&#x7EBF;&#x7A0B;&#xFF08;&#x901A;&#x5E38;&#x8D1F;&#x8D23; UI &#x4EA4;&#x4E92;&#xFF09;&#x80FD;&#x591F;&#x4FDD;&#x6301;&#x6D41;&#x7545;&#xFF0C;&#x4E0D;&#x4F1A;&#x88AB;&#x963B;&#x585E;&#x6216;&#x62D6;&#x6162;&#x3002;</p>
<p>Worker &#x7EBF;&#x7A0B;&#x4E00;&#x65E6;&#x65B0;&#x5EFA;&#x6210;&#x529F;&#xFF0C;&#x5C31;&#x4F1A;&#x59CB;&#x7EC8;&#x8FD0;&#x884C;&#xFF0C;&#x4E0D;&#x4F1A;&#x88AB;&#x4E3B;&#x7EBF;&#x7A0B;&#x4E0A;&#x7684;&#x6D3B;&#x52A8;&#xFF08;&#x6BD4;&#x5982;&#x7528;&#x6237;&#x70B9;&#x51FB;&#x6309;&#x94AE;&#x3001;&#x63D0;&#x4EA4;&#x8868;&#x5355;&#xFF09;&#x6253;&#x65AD;&#x3002;&#x8FD9;&#x6837;&#x6709;&#x5229;&#x4E8E;&#x968F;&#x65F6;&#x54CD;&#x5E94;&#x4E3B;&#x7EBF;&#x7A0B;&#x7684;&#x901A;&#x4FE1;&#x3002;&#x4F46;&#x662F;&#xFF0C;&#x8FD9;&#x4E5F;&#x9020;&#x6210;&#x4E86; Worker &#x6BD4;&#x8F83;&#x8017;&#x8D39;&#x8D44;&#x6E90;&#xFF0C;&#x4E0D;&#x5E94;&#x8BE5;&#x8FC7;&#x5EA6;&#x4F7F;&#x7528;&#xFF0C;&#x800C;&#x4E14;&#x4E00;&#x65E6;&#x4F7F;&#x7528;&#x5B8C;&#x6BD5;&#xFF0C;&#x5C31;&#x5E94;&#x8BE5;&#x5173;&#x95ED;&#x3002;</p>
<p>Web Worker &#x6709;&#x4EE5;&#x4E0B;&#x51E0;&#x4E2A;&#x4F7F;&#x7528;&#x6CE8;&#x610F;&#x70B9;&#x3002;</p>
<p>&#xFF08;1&#xFF09;<strong>&#x540C;&#x6E90;&#x9650;&#x5236;</strong></p>
<p>&#x5206;&#x914D;&#x7ED9; Worker &#x7EBF;&#x7A0B;&#x8FD0;&#x884C;&#x7684;&#x811A;&#x672C;&#x6587;&#x4EF6;&#xFF0C;&#x5FC5;&#x987B;&#x4E0E;&#x4E3B;&#x7EBF;&#x7A0B;&#x7684;&#x811A;&#x672C;&#x6587;&#x4EF6;&#x540C;&#x6E90;&#x3002;</p>
<p>&#xFF08;2&#xFF09;<strong>DOM &#x9650;&#x5236;</strong></p>
<p>Worker &#x7EBF;&#x7A0B;&#x6240;&#x5728;&#x7684;&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#xFF0C;&#x4E0E;&#x4E3B;&#x7EBF;&#x7A0B;&#x4E0D;&#x4E00;&#x6837;&#xFF0C;&#x65E0;&#x6CD5;&#x8BFB;&#x53D6;&#x4E3B;&#x7EBF;&#x7A0B;&#x6240;&#x5728;&#x7F51;&#x9875;&#x7684; DOM &#x5BF9;&#x8C61;&#xFF0C;&#x4E5F;&#x65E0;&#x6CD5;&#x4F7F;&#x7528;<code>document</code>&#x3001;<code>window</code>&#x3001;<code>parent</code>&#x8FD9;&#x4E9B;&#x5BF9;&#x8C61;&#x3002;&#x4F46;&#x662F;&#xFF0C;Worker &#x7EBF;&#x7A0B;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>navigator</code>&#x5BF9;&#x8C61;&#x548C;<code>location</code>&#x5BF9;&#x8C61;&#x3002;</p>
<p>&#xFF08;3&#xFF09;<strong>&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#x9650;&#x5236;</strong></p>
<p>Worker &#x7684;&#x5168;&#x5C40;&#x5BF9;&#x8C61;<code>WorkerGlobalScope</code>&#xFF0C;&#x4E0D;&#x540C;&#x4E8E;&#x7F51;&#x9875;&#x7684;&#x5168;&#x5C40;&#x5BF9;&#x8C61;<code>Window</code>&#xFF0C;&#x5F88;&#x591A;&#x63A5;&#x53E3;&#x62FF;&#x4E0D;&#x5230;&#x3002;&#x6BD4;&#x5982;&#xFF0C;&#x7406;&#x8BBA;&#x4E0A; Worker &#x7EBF;&#x7A0B;&#x4E0D;&#x80FD;&#x4F7F;&#x7528;<code>console.log</code>&#xFF0C;&#x56E0;&#x4E3A;&#x6807;&#x51C6;&#x91CC;&#x9762;&#x6CA1;&#x6709;&#x63D0;&#x5230; Worker &#x7684;&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#x5B58;&#x5728;<code>console</code>&#x63A5;&#x53E3;&#xFF0C;&#x53EA;&#x5B9A;&#x4E49;&#x4E86;<code>Navigator</code>&#x63A5;&#x53E3;&#x548C;<code>Location</code>&#x63A5;&#x53E3;&#x3002;&#x4E0D;&#x8FC7;&#xFF0C;&#x6D4F;&#x89C8;&#x5668;&#x5B9E;&#x9645;&#x4E0A;&#x652F;&#x6301; Worker &#x7EBF;&#x7A0B;&#x4F7F;&#x7528;<code>console.log</code>&#xFF0C;&#x4FDD;&#x9669;&#x7684;&#x505A;&#x6CD5;&#x8FD8;&#x662F;&#x4E0D;&#x4F7F;&#x7528;&#x8FD9;&#x4E2A;&#x65B9;&#x6CD5;&#x3002;</p>
<p>&#xFF08;4&#xFF09;<strong>&#x901A;&#x4FE1;&#x8054;&#x7CFB;</strong></p>
<p>Worker &#x7EBF;&#x7A0B;&#x548C;&#x4E3B;&#x7EBF;&#x7A0B;&#x4E0D;&#x5728;&#x540C;&#x4E00;&#x4E2A;&#x4E0A;&#x4E0B;&#x6587;&#x73AF;&#x5883;&#xFF0C;&#x5B83;&#x4EEC;&#x4E0D;&#x80FD;&#x76F4;&#x63A5;&#x901A;&#x4FE1;&#xFF0C;&#x5FC5;&#x987B;&#x901A;&#x8FC7;&#x6D88;&#x606F;&#x5B8C;&#x6210;&#x3002;</p>
<p>&#xFF08;5&#xFF09;<strong>&#x811A;&#x672C;&#x9650;&#x5236;</strong></p>
<p>Worker &#x7EBF;&#x7A0B;&#x4E0D;&#x80FD;&#x6267;&#x884C;<code>alert()</code>&#x65B9;&#x6CD5;&#x548C;<code>confirm()</code>&#x65B9;&#x6CD5;&#xFF0C;&#x4F46;&#x53EF;&#x4EE5;&#x4F7F;&#x7528; XMLHttpRequest &#x5BF9;&#x8C61;&#x53D1;&#x51FA; AJAX &#x8BF7;&#x6C42;&#x3002;</p>
<p>&#xFF08;6&#xFF09;<strong>&#x6587;&#x4EF6;&#x9650;&#x5236;</strong></p>
<p>Worker &#x7EBF;&#x7A0B;&#x65E0;&#x6CD5;&#x8BFB;&#x53D6;&#x672C;&#x5730;&#x6587;&#x4EF6;&#xFF0C;&#x5373;&#x4E0D;&#x80FD;&#x6253;&#x5F00;&#x672C;&#x673A;&#x7684;&#x6587;&#x4EF6;&#x7CFB;&#x7EDF;&#xFF08;<code>file://</code>&#xFF09;&#xFF0C;&#x5B83;&#x6240;&#x52A0;&#x8F7D;&#x7684;&#x811A;&#x672C;&#xFF0C;&#x5FC5;&#x987B;&#x6765;&#x81EA;&#x7F51;&#x7EDC;&#x3002;</p>
<h2 id="&#x57FA;&#x672C;&#x7528;&#x6CD5;">&#x57FA;&#x672C;&#x7528;&#x6CD5;</h2>
<h3 id="&#x4E3B;&#x7EBF;&#x7A0B;">&#x4E3B;&#x7EBF;&#x7A0B;</h3>
<p>&#x4E3B;&#x7EBF;&#x7A0B;&#x91C7;&#x7528;<code>new</code>&#x547D;&#x4EE4;&#xFF0C;&#x8C03;&#x7528;<code>Worker()</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x65B0;&#x5EFA;&#x4E00;&#x4E2A; Worker &#x7EBF;&#x7A0B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> worker = <span class="hljs-keyword">new</span> Worker(<span class="hljs-string">&apos;work.js&apos;</span>);
</code></pre>
<p><code>Worker()</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x811A;&#x672C;&#x6587;&#x4EF6;&#xFF0C;&#x8BE5;&#x6587;&#x4EF6;&#x5C31;&#x662F; Worker &#x7EBF;&#x7A0B;&#x6240;&#x8981;&#x6267;&#x884C;&#x7684;&#x4EFB;&#x52A1;&#x3002;&#x7531;&#x4E8E; Worker &#x4E0D;&#x80FD;&#x8BFB;&#x53D6;&#x672C;&#x5730;&#x6587;&#x4EF6;&#xFF0C;&#x6240;&#x4EE5;&#x8FD9;&#x4E2A;&#x811A;&#x672C;&#x5FC5;&#x987B;&#x6765;&#x81EA;&#x7F51;&#x7EDC;&#x3002;&#x5982;&#x679C;&#x4E0B;&#x8F7D;&#x6CA1;&#x6709;&#x6210;&#x529F;&#xFF08;&#x6BD4;&#x5982;404&#x9519;&#x8BEF;&#xFF09;&#xFF0C;Worker &#x5C31;&#x4F1A;&#x9ED8;&#x9ED8;&#x5730;&#x5931;&#x8D25;&#x3002;</p>
<p>&#x7136;&#x540E;&#xFF0C;&#x4E3B;&#x7EBF;&#x7A0B;&#x8C03;&#x7528;<code>worker.postMessage()</code>&#x65B9;&#x6CD5;&#xFF0C;&#x5411; Worker &#x53D1;&#x6D88;&#x606F;&#x3002;</p>
<pre><code class="lang-javascript">worker.postMessage(<span class="hljs-string">&apos;Hello World&apos;</span>);
worker.postMessage({method: <span class="hljs-string">&apos;echo&apos;</span>, args: [<span class="hljs-string">&apos;Work&apos;</span>]});
</code></pre>
<p><code>worker.postMessage()</code>&#x65B9;&#x6CD5;&#x7684;&#x53C2;&#x6570;&#xFF0C;&#x5C31;&#x662F;&#x4E3B;&#x7EBF;&#x7A0B;&#x4F20;&#x7ED9; Worker &#x7684;&#x6570;&#x636E;&#x3002;&#x5B83;&#x53EF;&#x4EE5;&#x662F;&#x5404;&#x79CD;&#x6570;&#x636E;&#x7C7B;&#x578B;&#xFF0C;&#x5305;&#x62EC;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#x3002;</p>
<p>&#x63A5;&#x7740;&#xFF0C;&#x4E3B;&#x7EBF;&#x7A0B;&#x901A;&#x8FC7;<code>worker.onmessage</code>&#x6307;&#x5B9A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x63A5;&#x6536;&#x5B50;&#x7EBF;&#x7A0B;&#x53D1;&#x56DE;&#x6765;&#x7684;&#x6D88;&#x606F;&#x3002;</p>
<pre><code class="lang-javascript">worker.onmessage = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>) </span>{
  doSomething(event.data);
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">doSomething</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-comment">// &#x6267;&#x884C;&#x4EFB;&#x52A1;</span>
  worker.postMessage(<span class="hljs-string">&apos;Work done!&apos;</span>);
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x4E8B;&#x4EF6;&#x5BF9;&#x8C61;&#x7684;<code>data</code>&#x5C5E;&#x6027;&#x53EF;&#x4EE5;&#x83B7;&#x53D6; Worker &#x53D1;&#x6765;&#x7684;&#x6570;&#x636E;&#x3002;</p>
<p>Worker &#x5B8C;&#x6210;&#x4EFB;&#x52A1;&#x4EE5;&#x540E;&#xFF0C;&#x4E3B;&#x7EBF;&#x7A0B;&#x5C31;&#x53EF;&#x4EE5;&#x628A;&#x5B83;&#x5173;&#x6389;&#x3002;</p>
<pre><code class="lang-javascript">worker.terminate();
</code></pre>
<h3 id="worker-&#x7EBF;&#x7A0B;">Worker &#x7EBF;&#x7A0B;</h3>
<p>Worker &#x7EBF;&#x7A0B;&#x5185;&#x90E8;&#x9700;&#x8981;&#x6709;&#x4E00;&#x4E2A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x76D1;&#x542C;<code>message</code>&#x4E8B;&#x4EF6;&#x3002;</p>
<pre><code class="lang-javascript">self.addEventListener(<span class="hljs-string">&apos;message&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
  self.postMessage(<span class="hljs-string">&apos;You said: &apos;</span> + e.data);
}, <span class="hljs-literal">false</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>self</code>&#x4EE3;&#x8868;&#x5B50;&#x7EBF;&#x7A0B;&#x81EA;&#x8EAB;&#xFF0C;&#x5373;&#x5B50;&#x7EBF;&#x7A0B;&#x7684;&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#x3002;&#x56E0;&#x6B64;&#xFF0C;&#x7B49;&#x540C;&#x4E8E;&#x4E0B;&#x9762;&#x4E24;&#x79CD;&#x5199;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x5199;&#x6CD5;&#x4E00;</span>
<span class="hljs-keyword">this</span>.addEventListener(<span class="hljs-string">&apos;message&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
  <span class="hljs-keyword">this</span>.postMessage(<span class="hljs-string">&apos;You said: &apos;</span> + e.data);
}, <span class="hljs-literal">false</span>);

<span class="hljs-comment">// &#x5199;&#x6CD5;&#x4E8C;</span>
addEventListener(<span class="hljs-string">&apos;message&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
  postMessage(<span class="hljs-string">&apos;You said: &apos;</span> + e.data);
}, <span class="hljs-literal">false</span>);
</code></pre>
<p>&#x9664;&#x4E86;&#x4F7F;&#x7528;<code>self.addEventListener()</code>&#x6307;&#x5B9A;&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;<code>self.onmessage</code>&#x6307;&#x5B9A;&#x3002;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x7684;&#x53C2;&#x6570;&#x662F;&#x4E00;&#x4E2A;&#x4E8B;&#x4EF6;&#x5BF9;&#x8C61;&#xFF0C;&#x5B83;&#x7684;<code>data</code>&#x5C5E;&#x6027;&#x5305;&#x542B;&#x4E3B;&#x7EBF;&#x7A0B;&#x53D1;&#x6765;&#x7684;&#x6570;&#x636E;&#x3002;<code>self.postMessage()</code>&#x65B9;&#x6CD5;&#x7528;&#x6765;&#x5411;&#x4E3B;&#x7EBF;&#x7A0B;&#x53D1;&#x9001;&#x6D88;&#x606F;&#x3002;</p>
<p>&#x6839;&#x636E;&#x4E3B;&#x7EBF;&#x7A0B;&#x53D1;&#x6765;&#x7684;&#x6570;&#x636E;&#xFF0C;Worker &#x7EBF;&#x7A0B;&#x53EF;&#x4EE5;&#x8C03;&#x7528;&#x4E0D;&#x540C;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript">self.addEventListener(<span class="hljs-string">&apos;message&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
  <span class="hljs-keyword">var</span> data = e.data;
  <span class="hljs-keyword">switch</span> (data.cmd) {
    <span class="hljs-keyword">case</span> <span class="hljs-string">&apos;start&apos;</span>:
      self.postMessage(<span class="hljs-string">&apos;WORKER STARTED: &apos;</span> + data.msg);
      <span class="hljs-keyword">break</span>;
    <span class="hljs-keyword">case</span> <span class="hljs-string">&apos;stop&apos;</span>:
      self.postMessage(<span class="hljs-string">&apos;WORKER STOPPED: &apos;</span> + data.msg);
      self.close(); <span class="hljs-comment">// Terminates the worker.</span>
      <span class="hljs-keyword">break</span>;
    <span class="hljs-keyword">default</span>:
      self.postMessage(<span class="hljs-string">&apos;Unknown command: &apos;</span> + data.msg);
  };
}, <span class="hljs-literal">false</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;<code>self.close()</code>&#x7528;&#x4E8E;&#x5728; Worker &#x5185;&#x90E8;&#x5173;&#x95ED;&#x81EA;&#x8EAB;&#x3002;</p>
<h3 id="worker-&#x52A0;&#x8F7D;&#x811A;&#x672C;">Worker &#x52A0;&#x8F7D;&#x811A;&#x672C;</h3>
<p>Worker &#x5185;&#x90E8;&#x5982;&#x679C;&#x8981;&#x52A0;&#x8F7D;&#x5176;&#x4ED6;&#x811A;&#x672C;&#xFF0C;&#x6709;&#x4E00;&#x4E2A;&#x4E13;&#x95E8;&#x7684;&#x65B9;&#x6CD5;<code>importScripts()</code>&#x3002;</p>
<pre><code class="lang-javascript">importScripts(<span class="hljs-string">&apos;script1.js&apos;</span>);
</code></pre>
<p>&#x8BE5;&#x65B9;&#x6CD5;&#x53EF;&#x4EE5;&#x540C;&#x65F6;&#x52A0;&#x8F7D;&#x591A;&#x4E2A;&#x811A;&#x672C;&#x3002;</p>
<pre><code class="lang-javascript">importScripts(<span class="hljs-string">&apos;script1.js&apos;</span>, <span class="hljs-string">&apos;script2.js&apos;</span>);
</code></pre>
<h3 id="&#x9519;&#x8BEF;&#x5904;&#x7406;">&#x9519;&#x8BEF;&#x5904;&#x7406;</h3>
<p>&#x4E3B;&#x7EBF;&#x7A0B;&#x53EF;&#x4EE5;&#x76D1;&#x542C; Worker &#x662F;&#x5426;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#x3002;&#x5982;&#x679C;&#x53D1;&#x751F;&#x9519;&#x8BEF;&#xFF0C;Worker &#x4F1A;&#x89E6;&#x53D1;&#x4E3B;&#x7EBF;&#x7A0B;&#x7684;<code>error</code>&#x4E8B;&#x4EF6;&#x3002;</p>
<pre><code class="lang-javascript">worker.onerror(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>) </span>{
  <span class="hljs-built_in">console</span>.log([
    <span class="hljs-string">&apos;ERROR: Line &apos;</span>, event.lineno, <span class="hljs-string">&apos; in &apos;</span>, event.filename, <span class="hljs-string">&apos;: &apos;</span>, event.message
  ].join(<span class="hljs-string">&apos;&apos;</span>));
});

<span class="hljs-comment">// &#x6216;&#x8005;</span>
worker.addEventListener(<span class="hljs-string">&apos;error&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>) </span>{
  <span class="hljs-comment">// ...</span>
});
</code></pre>
<p>Worker &#x5185;&#x90E8;&#x4E5F;&#x53EF;&#x4EE5;&#x76D1;&#x542C;<code>error</code>&#x4E8B;&#x4EF6;&#x3002;</p>
<h3 id="&#x5173;&#x95ED;-worker">&#x5173;&#x95ED; Worker</h3>
<p>&#x4F7F;&#x7528;&#x5B8C;&#x6BD5;&#xFF0C;&#x4E3A;&#x4E86;&#x8282;&#x7701;&#x7CFB;&#x7EDF;&#x8D44;&#x6E90;&#xFF0C;&#x5FC5;&#x987B;&#x5173;&#x95ED; Worker&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x4E3B;&#x7EBF;&#x7A0B;</span>
worker.terminate();

<span class="hljs-comment">// Worker &#x7EBF;&#x7A0B;</span>
self.close();
</code></pre>
<h2 id="&#x6570;&#x636E;&#x901A;&#x4FE1;">&#x6570;&#x636E;&#x901A;&#x4FE1;</h2>
<p>&#x524D;&#x9762;&#x8BF4;&#x8FC7;&#xFF0C;&#x4E3B;&#x7EBF;&#x7A0B;&#x4E0E; Worker &#x4E4B;&#x95F4;&#x7684;&#x901A;&#x4FE1;&#x5185;&#x5BB9;&#xFF0C;&#x53EF;&#x4EE5;&#x662F;&#x6587;&#x672C;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x662F;&#x5BF9;&#x8C61;&#x3002;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x662F;&#xFF0C;&#x8FD9;&#x79CD;&#x901A;&#x4FE1;&#x662F;&#x62F7;&#x8D1D;&#x5173;&#x7CFB;&#xFF0C;&#x5373;&#x662F;&#x4F20;&#x503C;&#x800C;&#x4E0D;&#x662F;&#x4F20;&#x5740;&#xFF0C;Worker &#x5BF9;&#x901A;&#x4FE1;&#x5185;&#x5BB9;&#x7684;&#x4FEE;&#x6539;&#xFF0C;&#x4E0D;&#x4F1A;&#x5F71;&#x54CD;&#x5230;&#x4E3B;&#x7EBF;&#x7A0B;&#x3002;&#x4E8B;&#x5B9E;&#x4E0A;&#xFF0C;&#x6D4F;&#x89C8;&#x5668;&#x5185;&#x90E8;&#x7684;&#x8FD0;&#x884C;&#x673A;&#x5236;&#x662F;&#xFF0C;&#x5148;&#x5C06;&#x901A;&#x4FE1;&#x5185;&#x5BB9;&#x4E32;&#x884C;&#x5316;&#xFF0C;&#x7136;&#x540E;&#x628A;&#x4E32;&#x884C;&#x5316;&#x540E;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x53D1;&#x7ED9; Worker&#xFF0C;&#x540E;&#x8005;&#x518D;&#x5C06;&#x5B83;&#x8FD8;&#x539F;&#x3002;</p>
<p>&#x4E3B;&#x7EBF;&#x7A0B;&#x4E0E; Worker &#x4E4B;&#x95F4;&#x4E5F;&#x53EF;&#x4EE5;&#x4EA4;&#x6362;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#xFF0C;&#x6BD4;&#x5982; File&#x3001;Blob&#x3001;ArrayBuffer &#x7B49;&#x7C7B;&#x578B;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x5728;&#x7EBF;&#x7A0B;&#x4E4B;&#x95F4;&#x53D1;&#x9001;&#x3002;&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x4E3B;&#x7EBF;&#x7A0B;</span>
<span class="hljs-keyword">var</span> uInt8Array = <span class="hljs-keyword">new</span> <span class="hljs-built_in">Uint8Array</span>(<span class="hljs-keyword">new</span> <span class="hljs-built_in">ArrayBuffer</span>(<span class="hljs-number">10</span>));
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>; i &lt; uInt8Array.length; ++i) {
  uInt8Array[i] = i * <span class="hljs-number">2</span>; <span class="hljs-comment">// [0, 2, 4, 6, 8,...]</span>
}
worker.postMessage(uInt8Array);

<span class="hljs-comment">// Worker &#x7EBF;&#x7A0B;</span>
self.onmessage = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
  <span class="hljs-keyword">var</span> uInt8Array = e.data;
  postMessage(<span class="hljs-string">&apos;Inside worker.js: uInt8Array.toString() = &apos;</span> + uInt8Array.toString());
  postMessage(<span class="hljs-string">&apos;Inside worker.js: uInt8Array.byteLength = &apos;</span> + uInt8Array.byteLength);
};
</code></pre>
<p>&#x4F46;&#x662F;&#xFF0C;&#x62F7;&#x8D1D;&#x65B9;&#x5F0F;&#x53D1;&#x9001;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#xFF0C;&#x4F1A;&#x9020;&#x6210;&#x6027;&#x80FD;&#x95EE;&#x9898;&#x3002;&#x6BD4;&#x5982;&#xFF0C;&#x4E3B;&#x7EBF;&#x7A0B;&#x5411; Worker &#x53D1;&#x9001;&#x4E00;&#x4E2A; 500MB &#x6587;&#x4EF6;&#xFF0C;&#x9ED8;&#x8BA4;&#x60C5;&#x51B5;&#x4E0B;&#x6D4F;&#x89C8;&#x5668;&#x4F1A;&#x751F;&#x6210;&#x4E00;&#x4E2A;&#x539F;&#x6587;&#x4EF6;&#x7684;&#x62F7;&#x8D1D;&#x3002;&#x4E3A;&#x4E86;&#x89E3;&#x51B3;&#x8FD9;&#x4E2A;&#x95EE;&#x9898;&#xFF0C;JavaScript &#x5141;&#x8BB8;&#x4E3B;&#x7EBF;&#x7A0B;&#x628A;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#x76F4;&#x63A5;&#x8F6C;&#x79FB;&#x7ED9;&#x5B50;&#x7EBF;&#x7A0B;&#xFF0C;&#x4F46;&#x662F;&#x4E00;&#x65E6;&#x8F6C;&#x79FB;&#xFF0C;&#x4E3B;&#x7EBF;&#x7A0B;&#x5C31;&#x65E0;&#x6CD5;&#x518D;&#x4F7F;&#x7528;&#x8FD9;&#x4E9B;&#x4E8C;&#x8FDB;&#x5236;&#x6570;&#x636E;&#x4E86;&#xFF0C;&#x8FD9;&#x662F;&#x4E3A;&#x4E86;&#x9632;&#x6B62;&#x51FA;&#x73B0;&#x591A;&#x4E2A;&#x7EBF;&#x7A0B;&#x540C;&#x65F6;&#x4FEE;&#x6539;&#x6570;&#x636E;&#x7684;&#x9EBB;&#x70E6;&#x5C40;&#x9762;&#x3002;&#x8FD9;&#x79CD;&#x8F6C;&#x79FB;&#x6570;&#x636E;&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x53EB;&#x505A;<a href="http://www.w3.org/html/wg/drafts/html/master/infrastructure.html#transferable-objects" target="_blank" rel="nofollow">Transferable Objects</a>&#x3002;&#x8FD9;&#x4F7F;&#x5F97;&#x4E3B;&#x7EBF;&#x7A0B;&#x53EF;&#x4EE5;&#x5FEB;&#x901F;&#x628A;&#x6570;&#x636E;&#x4EA4;&#x7ED9; Worker&#xFF0C;&#x5BF9;&#x4E8E;&#x5F71;&#x50CF;&#x5904;&#x7406;&#x3001;&#x58F0;&#x97F3;&#x5904;&#x7406;&#x3001;3D &#x8FD0;&#x7B97;&#x7B49;&#x5C31;&#x975E;&#x5E38;&#x65B9;&#x4FBF;&#x4E86;&#xFF0C;&#x4E0D;&#x4F1A;&#x4EA7;&#x751F;&#x6027;&#x80FD;&#x8D1F;&#x62C5;&#x3002;</p>
<p>&#x5982;&#x679C;&#x8981;&#x76F4;&#x63A5;&#x8F6C;&#x79FB;&#x6570;&#x636E;&#x7684;&#x63A7;&#x5236;&#x6743;&#xFF0C;&#x5C31;&#x8981;&#x4F7F;&#x7528;&#x4E0B;&#x9762;&#x7684;&#x5199;&#x6CD5;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// Transferable Objects &#x683C;&#x5F0F;</span>
worker.postMessage(arrayBuffer, [arrayBuffer]);

<span class="hljs-comment">// &#x4F8B;&#x5B50;</span>
<span class="hljs-keyword">var</span> ab = <span class="hljs-keyword">new</span> <span class="hljs-built_in">ArrayBuffer</span>(<span class="hljs-number">1</span>);
worker.postMessage(ab, [ab]);
</code></pre>
<h2 id="&#x540C;&#x9875;&#x9762;&#x7684;-web-worker">&#x540C;&#x9875;&#x9762;&#x7684; Web Worker</h2>
<p>&#x901A;&#x5E38;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;Worker &#x8F7D;&#x5165;&#x7684;&#x662F;&#x4E00;&#x4E2A;&#x5355;&#x72EC;&#x7684; JavaScript &#x811A;&#x672C;&#x6587;&#x4EF6;&#xFF0C;&#x4F46;&#x662F;&#x4E5F;&#x53EF;&#x4EE5;&#x8F7D;&#x5165;&#x4E0E;&#x4E3B;&#x7EBF;&#x7A0B;&#x5728;&#x540C;&#x4E00;&#x4E2A;&#x7F51;&#x9875;&#x7684;&#x4EE3;&#x7801;&#x3002;</p>
<pre><code class="lang-html"><span class="hljs-meta">&lt;!DOCTYPE html&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">body</span>&gt;</span>
    <span class="hljs-tag">&lt;<span class="hljs-name">script</span> <span class="hljs-attr">id</span>=<span class="hljs-string">&quot;worker&quot;</span> <span class="hljs-attr">type</span>=<span class="hljs-string">&quot;app/worker&quot;</span>&gt;</span><span class="actionscript">
      addEventListener(<span class="hljs-string">&apos;message&apos;</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-params">()</span> </span>{
        postMessage(<span class="hljs-string">&apos;some message&apos;</span>);
      }, <span class="hljs-literal">false</span>);
    </span><span class="hljs-tag">&lt;/<span class="hljs-name">script</span>&gt;</span>
  <span class="hljs-tag">&lt;/<span class="hljs-name">body</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">html</span>&gt;</span>
</code></pre>
<p>&#x4E0A;&#x9762;&#x662F;&#x4E00;&#x6BB5;&#x5D4C;&#x5165;&#x7F51;&#x9875;&#x7684;&#x811A;&#x672C;&#xFF0C;&#x6CE8;&#x610F;&#x5FC5;&#x987B;&#x6307;&#x5B9A;<code>&lt;script&gt;</code>&#x6807;&#x7B7E;&#x7684;<code>type</code>&#x5C5E;&#x6027;&#x662F;&#x4E00;&#x4E2A;&#x6D4F;&#x89C8;&#x5668;&#x4E0D;&#x8BA4;&#x8BC6;&#x7684;&#x503C;&#xFF0C;&#x4E0A;&#x4F8B;&#x662F;<code>app/worker</code>&#x3002;</p>
<p>&#x7136;&#x540E;&#xFF0C;&#x8BFB;&#x53D6;&#x8FD9;&#x4E00;&#x6BB5;&#x5D4C;&#x5165;&#x9875;&#x9762;&#x7684;&#x811A;&#x672C;&#xFF0C;&#x7528; Worker &#x6765;&#x5904;&#x7406;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> blob = <span class="hljs-keyword">new</span> Blob([<span class="hljs-built_in">document</span>.querySelector(<span class="hljs-string">&apos;#worker&apos;</span>).textContent]);
<span class="hljs-keyword">var</span> url = <span class="hljs-built_in">window</span>.URL.createObjectURL(blob);
<span class="hljs-keyword">var</span> worker = <span class="hljs-keyword">new</span> Worker(url);

worker.onmessage = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
  <span class="hljs-comment">// e.data === &apos;some message&apos;</span>
};
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;&#x5148;&#x5C06;&#x5D4C;&#x5165;&#x7F51;&#x9875;&#x7684;&#x811A;&#x672C;&#x4EE3;&#x7801;&#xFF0C;&#x8F6C;&#x6210;&#x4E00;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x5BF9;&#x8C61;&#xFF0C;&#x7136;&#x540E;&#x4E3A;&#x8FD9;&#x4E2A;&#x4E8C;&#x8FDB;&#x5236;&#x5BF9;&#x8C61;&#x751F;&#x6210; URL&#xFF0C;&#x518D;&#x8BA9; Worker &#x52A0;&#x8F7D;&#x8FD9;&#x4E2A; URL&#x3002;&#x8FD9;&#x6837;&#x5C31;&#x505A;&#x5230;&#x4E86;&#xFF0C;&#x4E3B;&#x7EBF;&#x7A0B;&#x548C; Worker &#x7684;&#x4EE3;&#x7801;&#x90FD;&#x5728;&#x540C;&#x4E00;&#x4E2A;&#x7F51;&#x9875;&#x4E0A;&#x9762;&#x3002;</p>
<h2 id="&#x5B9E;&#x4F8B;&#xFF1A;worker-&#x7EBF;&#x7A0B;&#x5B8C;&#x6210;&#x8F6E;&#x8BE2;">&#x5B9E;&#x4F8B;&#xFF1A;Worker &#x7EBF;&#x7A0B;&#x5B8C;&#x6210;&#x8F6E;&#x8BE2;</h2>
<p>&#x6709;&#x65F6;&#xFF0C;&#x6D4F;&#x89C8;&#x5668;&#x9700;&#x8981;&#x8F6E;&#x8BE2;&#x670D;&#x52A1;&#x5668;&#x72B6;&#x6001;&#xFF0C;&#x4EE5;&#x4FBF;&#x7B2C;&#x4E00;&#x65F6;&#x95F4;&#x5F97;&#x77E5;&#x72B6;&#x6001;&#x6539;&#x53D8;&#x3002;&#x8FD9;&#x4E2A;&#x5DE5;&#x4F5C;&#x53EF;&#x4EE5;&#x653E;&#x5728; Worker &#x91CC;&#x9762;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">createWorker</span>(<span class="hljs-params">f</span>) </span>{
  <span class="hljs-keyword">var</span> blob = <span class="hljs-keyword">new</span> Blob([<span class="hljs-string">&apos;(&apos;</span> + f.toString() + <span class="hljs-string">&apos;)()&apos;</span>]);
  <span class="hljs-keyword">var</span> url = <span class="hljs-built_in">window</span>.URL.createObjectURL(blob);
  <span class="hljs-keyword">var</span> worker = <span class="hljs-keyword">new</span> Worker(url);
  <span class="hljs-keyword">return</span> worker;
}

<span class="hljs-keyword">var</span> pollingWorker = createWorker(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">e</span>) </span>{
  <span class="hljs-keyword">var</span> cache;

  <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">compare</span>(<span class="hljs-params">new, old</span>) </span>{ ... };

  setInterval(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
    fetch(<span class="hljs-string">&apos;/my-api-endpoint&apos;</span>).then(<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">res</span>) </span>{
      <span class="hljs-keyword">var</span> data = res.json();

      <span class="hljs-keyword">if</span> (!compare(data, cache)) {
        cache = data;
        self.postMessage(data);
      }
    })
  }, <span class="hljs-number">1000</span>)
});

pollingWorker.onmessage = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-comment">// render data</span>
}

pollingWorker.postMessage(<span class="hljs-string">&apos;init&apos;</span>);
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;Worker &#x6BCF;&#x79D2;&#x949F;&#x8F6E;&#x8BE2;&#x4E00;&#x6B21;&#x6570;&#x636E;&#xFF0C;&#x7136;&#x540E;&#x8DDF;&#x7F13;&#x5B58;&#x505A;&#x6BD4;&#x8F83;&#x3002;&#x5982;&#x679C;&#x4E0D;&#x4E00;&#x81F4;&#xFF0C;&#x5C31;&#x8BF4;&#x660E;&#x670D;&#x52A1;&#x7AEF;&#x6709;&#x4E86;&#x65B0;&#x7684;&#x53D8;&#x5316;&#xFF0C;&#x56E0;&#x6B64;&#x5C31;&#x8981;&#x901A;&#x77E5;&#x4E3B;&#x7EBF;&#x7A0B;&#x3002;</p>
<h2 id="&#x5B9E;&#x4F8B;&#xFF1A;-worker-&#x65B0;&#x5EFA;-worker">&#x5B9E;&#x4F8B;&#xFF1A; Worker &#x65B0;&#x5EFA; Worker</h2>
<p>Worker &#x7EBF;&#x7A0B;&#x5185;&#x90E8;&#x8FD8;&#x80FD;&#x518D;&#x65B0;&#x5EFA; Worker &#x7EBF;&#x7A0B;&#xFF08;&#x76EE;&#x524D;&#x53EA;&#x6709; Firefox &#x6D4F;&#x89C8;&#x5668;&#x652F;&#x6301;&#xFF09;&#x3002;&#x4E0B;&#x9762;&#x7684;&#x4F8B;&#x5B50;&#x662F;&#x5C06;&#x4E00;&#x4E2A;&#x8BA1;&#x7B97;&#x5BC6;&#x96C6;&#x7684;&#x4EFB;&#x52A1;&#xFF0C;&#x5206;&#x914D;&#x5230;10&#x4E2A; Worker&#x3002;</p>
<p>&#x4E3B;&#x7EBF;&#x7A0B;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> worker = <span class="hljs-keyword">new</span> Worker(<span class="hljs-string">&apos;worker.js&apos;</span>);
worker.onmessage = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params">event</span>) </span>{
  <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;result&apos;</span>).textContent = event.data;
};
</code></pre>
<p>Worker &#x7EBF;&#x7A0B;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// worker.js</span>

<span class="hljs-comment">// settings</span>
<span class="hljs-keyword">var</span> num_workers = <span class="hljs-number">10</span>;
<span class="hljs-keyword">var</span> items_per_worker = <span class="hljs-number">1000000</span>;

<span class="hljs-comment">// start the workers</span>
<span class="hljs-keyword">var</span> result = <span class="hljs-number">0</span>;
<span class="hljs-keyword">var</span> pending_workers = num_workers;
<span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>; i &lt; num_workers; i += <span class="hljs-number">1</span>) {
  <span class="hljs-keyword">var</span> worker = <span class="hljs-keyword">new</span> Worker(<span class="hljs-string">&apos;core.js&apos;</span>);
  worker.postMessage(i * items_per_worker);
  worker.postMessage((i + <span class="hljs-number">1</span>) * items_per_worker);
  worker.onmessage = storeResult;
}

<span class="hljs-comment">// handle the results</span>
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">storeResult</span>(<span class="hljs-params">event</span>) </span>{
  result += event.data;
  pending_workers -= <span class="hljs-number">1</span>;
  <span class="hljs-keyword">if</span> (pending_workers &lt;= <span class="hljs-number">0</span>)
    postMessage(result); <span class="hljs-comment">// finished!</span>
}
</code></pre>
<p>&#x4E0A;&#x9762;&#x4EE3;&#x7801;&#x4E2D;&#xFF0C;Worker &#x7EBF;&#x7A0B;&#x5185;&#x90E8;&#x65B0;&#x5EFA;&#x4E86;10&#x4E2A; Worker &#x7EBF;&#x7A0B;&#xFF0C;&#x5E76;&#x4E14;&#x4F9D;&#x6B21;&#x5411;&#x8FD9;10&#x4E2A; Worker &#x53D1;&#x9001;&#x6D88;&#x606F;&#xFF0C;&#x544A;&#x77E5;&#x4E86;&#x8BA1;&#x7B97;&#x7684;&#x8D77;&#x70B9;&#x548C;&#x7EC8;&#x70B9;&#x3002;&#x8BA1;&#x7B97;&#x4EFB;&#x52A1;&#x811A;&#x672C;&#x7684;&#x4EE3;&#x7801;&#x5982;&#x4E0B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// core.js</span>
<span class="hljs-keyword">var</span> start;
onmessage = getStart;
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getStart</span>(<span class="hljs-params">event</span>) </span>{
  start = event.data;
  onmessage = getEnd;
}

<span class="hljs-keyword">var</span> end;
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">getEnd</span>(<span class="hljs-params">event</span>) </span>{
  end = event.data;
  onmessage = <span class="hljs-literal">null</span>;
  work();
}

<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">work</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-keyword">var</span> result = <span class="hljs-number">0</span>;
  <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = start; i &lt; end; i += <span class="hljs-number">1</span>) {
    <span class="hljs-comment">// perform some complex calculation here</span>
    result += <span class="hljs-number">1</span>;
  }
  postMessage(result);
  close();
}
</code></pre>
<h2 id="api">API</h2>
<h3 id="&#x4E3B;&#x7EBF;&#x7A0B;">&#x4E3B;&#x7EBF;&#x7A0B;</h3>
<p>&#x6D4F;&#x89C8;&#x5668;&#x539F;&#x751F;&#x63D0;&#x4F9B;<code>Worker()</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x7528;&#x6765;&#x4F9B;&#x4E3B;&#x7EBF;&#x7A0B;&#x751F;&#x6210; Worker &#x7EBF;&#x7A0B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> myWorker = <span class="hljs-keyword">new</span> Worker(jsUrl, options);
</code></pre>
<p><code>Worker()</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#xFF0C;&#x53EF;&#x4EE5;&#x63A5;&#x53D7;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#x3002;&#x7B2C;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x662F;&#x811A;&#x672C;&#x7684;&#x7F51;&#x5740;&#xFF08;&#x5FC5;&#x987B;&#x9075;&#x5B88;&#x540C;&#x6E90;&#x653F;&#x7B56;&#xFF09;&#xFF0C;&#x8BE5;&#x53C2;&#x6570;&#x662F;&#x5FC5;&#x9700;&#x7684;&#xFF0C;&#x4E14;&#x53EA;&#x80FD;&#x52A0;&#x8F7D; JS &#x811A;&#x672C;&#xFF0C;&#x5426;&#x5219;&#x4F1A;&#x62A5;&#x9519;&#x3002;&#x7B2C;&#x4E8C;&#x4E2A;&#x53C2;&#x6570;&#x662F;&#x914D;&#x7F6E;&#x5BF9;&#x8C61;&#xFF0C;&#x8BE5;&#x5BF9;&#x8C61;&#x53EF;&#x9009;&#x3002;&#x5B83;&#x7684;&#x4E00;&#x4E2A;&#x4F5C;&#x7528;&#x5C31;&#x662F;&#x6307;&#x5B9A; Worker &#x7684;&#x540D;&#x79F0;&#xFF0C;&#x7528;&#x6765;&#x533A;&#x5206;&#x591A;&#x4E2A; Worker &#x7EBF;&#x7A0B;&#x3002;</p>
<pre><code class="lang-javascript"><span class="hljs-comment">// &#x4E3B;&#x7EBF;&#x7A0B;</span>
<span class="hljs-keyword">var</span> myWorker = <span class="hljs-keyword">new</span> Worker(<span class="hljs-string">&apos;worker.js&apos;</span>, { name : <span class="hljs-string">&apos;myWorker&apos;</span> });

<span class="hljs-comment">// Worker &#x7EBF;&#x7A0B;</span>
self.name <span class="hljs-comment">// myWorker</span>
</code></pre>
<p><code>Worker()</code>&#x6784;&#x9020;&#x51FD;&#x6570;&#x8FD4;&#x56DE;&#x4E00;&#x4E2A; Worker &#x7EBF;&#x7A0B;&#x5BF9;&#x8C61;&#xFF0C;&#x7528;&#x6765;&#x4F9B;&#x4E3B;&#x7EBF;&#x7A0B;&#x64CD;&#x4F5C; Worker&#x3002;Worker &#x7EBF;&#x7A0B;&#x5BF9;&#x8C61;&#x7684;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#x5982;&#x4E0B;&#x3002;</p>
<ul>
<li>Worker.onerror&#xFF1A;&#x6307;&#x5B9A; error &#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;</li>
<li>Worker.onmessage&#xFF1A;&#x6307;&#x5B9A; message &#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#xFF0C;&#x53D1;&#x9001;&#x8FC7;&#x6765;&#x7684;&#x6570;&#x636E;&#x5728;<code>Event.data</code>&#x5C5E;&#x6027;&#x4E2D;&#x3002;</li>
<li>Worker.onmessageerror&#xFF1A;&#x6307;&#x5B9A; messageerror &#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;&#x53D1;&#x9001;&#x7684;&#x6570;&#x636E;&#x65E0;&#x6CD5;&#x5E8F;&#x5217;&#x5316;&#x6210;&#x5B57;&#x7B26;&#x4E32;&#x65F6;&#xFF0C;&#x4F1A;&#x89E6;&#x53D1;&#x8FD9;&#x4E2A;&#x4E8B;&#x4EF6;&#x3002;</li>
<li>Worker.postMessage()&#xFF1A;&#x5411; Worker &#x7EBF;&#x7A0B;&#x53D1;&#x9001;&#x6D88;&#x606F;&#x3002;</li>
<li>Worker.terminate()&#xFF1A;&#x7ACB;&#x5373;&#x7EC8;&#x6B62; Worker &#x7EBF;&#x7A0B;&#x3002;</li>
</ul>
<h3 id="worker-&#x7EBF;&#x7A0B;">Worker &#x7EBF;&#x7A0B;</h3>
<p>Web Worker &#x6709;&#x81EA;&#x5DF1;&#x7684;&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#xFF0C;&#x4E0D;&#x662F;&#x4E3B;&#x7EBF;&#x7A0B;&#x7684;<code>window</code>&#xFF0C;&#x800C;&#x662F;&#x4E00;&#x4E2A;&#x4E13;&#x95E8;&#x4E3A; Worker &#x5B9A;&#x5236;&#x7684;&#x5168;&#x5C40;&#x5BF9;&#x8C61;&#x3002;&#x56E0;&#x6B64;&#x5B9A;&#x4E49;&#x5728;<code>window</code>&#x4E0A;&#x9762;&#x7684;&#x5BF9;&#x8C61;&#x548C;&#x65B9;&#x6CD5;&#x4E0D;&#x662F;&#x5168;&#x90E8;&#x90FD;&#x53EF;&#x4EE5;&#x4F7F;&#x7528;&#x3002;</p>
<p>Worker &#x7EBF;&#x7A0B;&#x6709;&#x4E00;&#x4E9B;&#x81EA;&#x5DF1;&#x7684;&#x5168;&#x5C40;&#x5C5E;&#x6027;&#x548C;&#x65B9;&#x6CD5;&#x3002;</p>
<ul>
<li>self.name&#xFF1A; Worker &#x7684;&#x540D;&#x5B57;&#x3002;&#x8BE5;&#x5C5E;&#x6027;&#x53EA;&#x8BFB;&#xFF0C;&#x7531;&#x6784;&#x9020;&#x51FD;&#x6570;&#x6307;&#x5B9A;&#x3002;</li>
<li>self.onmessage&#xFF1A;&#x6307;&#x5B9A;<code>message</code>&#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;</li>
<li>self.onmessageerror&#xFF1A;&#x6307;&#x5B9A; messageerror &#x4E8B;&#x4EF6;&#x7684;&#x76D1;&#x542C;&#x51FD;&#x6570;&#x3002;&#x53D1;&#x9001;&#x7684;&#x6570;&#x636E;&#x65E0;&#x6CD5;&#x5E8F;&#x5217;&#x5316;&#x6210;&#x5B57;&#x7B26;&#x4E32;&#x65F6;&#xFF0C;&#x4F1A;&#x89E6;&#x53D1;&#x8FD9;&#x4E2A;&#x4E8B;&#x4EF6;&#x3002;</li>
<li>self.close()&#xFF1A;&#x5173;&#x95ED; Worker &#x7EBF;&#x7A0B;&#x3002;</li>
<li>self.postMessage()&#xFF1A;&#x5411;&#x4EA7;&#x751F;&#x8FD9;&#x4E2A; Worker &#x7EBF;&#x7A0B;&#x53D1;&#x9001;&#x6D88;&#x606F;&#x3002;</li>
<li>self.importScripts()&#xFF1A;&#x52A0;&#x8F7D; JS &#x811A;&#x672C;&#x3002;</li>
</ul>
<p>&#xFF08;&#x5B8C;&#xFF09;</p>




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